BHP explained

 

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Just lifted this off another forum. I found it mildly amusing no doubt its a repost

 

Lesson 1: BHP Explained

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Right, we've all noticed a lot of magazines and stuff quoting BHP figrues

against cars and I thought I should take the time to explain what these are.

 

Basically the figure they are quoting is the most important factor about the

performance of a "phat/wicked ride".

 

Brake horsepower and Torque are all very well, but the main figure that counts

is Bar Horse Power, this is the figure that you tell your mates down the pub.

 

 

To calculate this use the following rules:

 

STARTING POINT

The manufacturers generally handpick an engine that they know is on the right

end of tolerances for testing, this means that often its a higher figure than

an average new engine actaully makes, ignore this fact and swear blind that

your smoking nasty example of a now half f***ed engine makes the figure

claimed, round up whenever possible, so 152bhp = 160bhp etc

 

BOLT ON MODS

Obviously the correct way to get more power from your smoking engine with poor

valve seal and rings that are about as tight as Freddy Mercury's arse, the way

to get more power is to ignore those facts (see "starting point") and just bolt

tat onto the outside of it.

 

These mods can include filters/exhaust/dumpvalve etc, or even semi-internal mods

like cams, we wont cover things like bearings or rings cause those arent very

shiney so you wont want to replace them.

The manufacturers always state the gains that you will get from a mod, often

your car wont be listed specifically with a power gain, so just pick the

biggest one that is, if a skyline can pick up 22bhp from an exhaust, then so

can your saxo, again dont forget the golden "always round up" rule.

The figures should all be added up, and round up again.

 

 

ITS A GOOD'UN

You need to add a proportional value based on the "its a good'un" factor of your

engine, basically, as this is YOUR engine not anyone elses, its special, so the

mods will all make more difference, so multiply the number up a bit to take

this into account.

 

STICKERS / SPOILERS

Race cars have them, so you need them too, the key thing here is to not buy ones

that apply to anything you have fitted, go for stuff that isnt even made for

your car, so Greddy/HKS/Blitz is ideal for an XR2i.

Now the thing to remember with modifications to a vehicle is that they work in

harmony, it all comes together as a package, exhaust will compliment head mods,

filter will work well with a decat or whatever, now stickers are about attitude,

and attitude is what counts out there on the street (or halfords car park).

Take the % of your car covered by stickers and spoilers and add that onto your

BHP figure as an attitude adjustment (dont forget to round up!!)

 

 

 

WORKED EXAMPLE:

Fiesta XR2

quoted figure (use a guess if you cant find the manufacturers), 94bhp

filter (using the figure for a porche 911) - 11bhp

Exhaust (using figure for a skyline) - 22bhp

decat (never had one so you get this without doin anything, PHAT!) - 12bhp

sticker coverage = 47%

spoiler coverage = 12%

Its a good'un factor = 25%

 

 

We'll do the rounding first:

So the calcs are:

94 round up = 100

filter round up = 20

exahust round up = 30

decat round up = 20

sticker round up = 50%

spoiler round up = 20%

good'un round up = 30%

 

So 100 + 20 + 30 + 20 = 170

plus stickers 50% = 255

add spoiler factor 20% = 306

add good'un factor = 397.8

 

Final round up = 400bhp

 

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This however is only your basic Bar Horse Power figure, make sure when you quote

it you increase it inversely to the age of the girl you have with you at the

time, and in direct proportion to the number of pints you have consumed.

__________________

pmsl, thats about right mate!

:rofl: So mac is running about 7000 bar horse power? PHAT!

Bhav - is that the fiesta that was chasin you mate? :D

:rofl: So mac is PHAT!

 

:tongue:

lol whats happened to yer sig Rich? :rofl:

fakinell absolutely pmsl.

gonna use that one.

 

true story.

 

a guy about 18 yrs ols comes in my takeaway and starts talkin about a car hes gonna buy, as we're talking i let slip (On purpose ofcourse) that i own a zed tells him the figures BHp etc..

he then goes on to tell me how the car hes buying is a 800bhp golf.... i stand there listerning to all the shite he comes outwith thinking what a total utter t.w.a.t..

now i know where he got his figures from "The PHAT-o-meter"

lol whats happened to yer sig Rich? :rofl:

:rofl: :rofl: :rofl:

Thats exactly what it all sounds like to us numpty nuts who know sweet FA about it. at last the truth. :bow:

 

OK so where do yer get the fastest stickers from?

I think vini, your zed would benefit from a whacking huge red sony sticker on the back window, and also a big f**coff NOS sticker. Guaranteed extra 300 bhp....ups the "it's a good'un" factor too :D

i knew it... i was right... the lad in the RS turbo cabriolet 'scort who said he'd got "240bhp, hybrid turbo, etc" (it looked like a stock T2 to me) was telling porkies.

 

 

 

it was at least 375BHP by that chart and he was getting more stickers the next day..... monster indeed! PMSL

edit: an idiot at work stole my phone and decided to post here...

 

 

mods, please delete this post

Edited August 12, 200817 yr by DCarey

edit: an idiot at work stole my phone and decided to post here...

 

 

mods, please delete this post

 

i dont believe you so its stayin:tongue::rofl:

hilarious thread anyway :rofl: :rofl:

My Patrol must be a monster, lets see

 

Its got a 4.2 ltr engine, almost twice a skyline = 400bhp

Its got an exhaust= 22 for skyline, 44 for mine

A cam =30 for a skyline, 60 for mine

7 seats, that must add at least 12bhp

And it sits on 33" tyres with a 2" suspension lift = at least 50, must do.

And a distributor and we all know that they distribute the power so it must up it as well by about 16bhp.

 

So 400= 400

44= 50

60= 70

12= 20

50= 50

16= 20

 

610bhp :shock: no wonder I trashed the clutch